21440545332131 has 4 divisors (see below), whose sum is σ = 21564479120352. Its totient is φ = 21316611543912.

The previous prime is 21440545332071. The next prime is 21440545332149. The reversal of 21440545332131 is 13123354504412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21440545332131 - 2³⁸ = 21165667425187 is a prime.

It is a super-2 number, since 2×21440545332131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440545332161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61966893851 + ... + 61966894196.

It is an arithmetic number, because the mean of its divisors is an integer number (5391119780088).

Almost surely, 2^{21440545332131} is an apocalyptic number.

21440545332131 is a deficient number, since it is larger than the sum of its proper divisors (123933788221).

21440545332131 is a wasteful number, since it uses less digits than its factorization.

21440545332131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123933788220.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 21440545332131 its reverse (13123354504412), we get a palindrome (34563899836543).

The spelling of 21440545332131 in words is "twenty-one trillion, four hundred forty billion, five hundred forty-five million, three hundred thirty-two thousand, one hundred thirty-one".